AMERICAN FROGS OF THE GENUS RANA. 



469 



Measurements of type specimens in Millimeters 



1. 2. 3. 4. 



c? 9 9 9 



From snout to vent 73 77 65 58 



Head 25 25 21 20 



Width of head 30 29 24 23 



Snout 9 9 8 . 7.5 



Eye 9 9 8 7.5 



Interorbital width 4 4 3.5 3.5 



Tympanum 4.5 4.5 3.5 3 



Fore limb 47 45 40 36 



1st finger 10 10 9 8 



2nd " 9 9 8 7 



3rd " 11.5 ,11 10 9 



4th " 8 * 8 7 6 



Hind limb 125 122 104 98 



Tibia 40 39 32 29 



Foot 40 38- 32 31 



3rd toe 22 21 18 17 



4th " 33 31 27 26 



5th " 25 25 22 21 



1-4. loquiro. — 5-6. Barranca del Cobre. 



This species is very closely allied to R. hoylii, differing in the larger 

 eye, the more oblique loreal region, the more distinct tympanum, 

 the shorter tibia, and the absence of vocal sacs. 



18. Rana boylii. 



Rana hoylii Baird, Froc. Ac. Philad., 1854, p. 62, and Rep. U. S. Explor. 

 Surv., XII, ii, PI. xxix, figs. 2, 3 (1860); Cope, N. Am. Batr., p. 444, figs. 

 (1889); Stejneg., N. Am. Faun. No. 7, p. 226 (1893); Dickerson, Frog 

 Book, p. 221, PI. n, fig. 7, and PL lxxxiv, figs. 1-3 (1906); Camp, Univ. Calif. 

 Publ. Zool., XVII, 1917, p. 117; Bouleng., Ann and Mag. N. H. (9) III, 1919, 

 p. 411. 



Rana pachyderma Cope, Proc. Ac. Philad., 1883, p. 25. 



Rana boylii nmscosa Camp, t. c, p. 118. 



Rana boylii sierrce Camp, t. c, p. 120. 



Vomerine teeth in very feeble groups or oblique series close together 

 between or extending behind the level of the choanse, sometimes very 

 indistinct. 



